radv: Disable primitive restart for non-indexed draws

According to the Vulkan spec, VkPipelineInputAssemblyStateCreateInfo's
primitiveRestartEnable flag should only apply to indexed draws, however
it was being enabled regardless of the type of draw. This could cause
problems for non-indexed draws with >=65535 vertices if the previous
indexed draw used 16-bit indices.

Fixes corruption of the credits text in Mad Max.

v2: Reset primitive restart state after executing a secondary command
    buffer.

Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

2 files changed, 34 insertions, 22 deletions

diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index dbe8bf136c6..998b656509b 100644
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -855,9 +855,6 @@ radv_emit_graphics_pipeline(struct radv_cmd_buffer *cmd_buffer,
 	radv_emit_fragment_shader(cmd_buffer, pipeline);
 	polaris_set_vgt_vertex_reuse(cmd_buffer, pipeline);
 
-	radeon_set_context_reg(cmd_buffer->cs, R_028A94_VGT_MULTI_PRIM_IB_RESET_EN,
-			       pipeline->graphics.prim_restart_enable);
-
 	cmd_buffer->scratch_size_needed =
 	                          MAX2(cmd_buffer->scratch_size_needed,
 	                               pipeline->max_waves * pipeline->scratch_bytes_per_wave);
@@ -1394,9 +1391,32 @@ radv_flush_constants(struct radv_cmd_buffer *cmd_buffer,
 	cmd_buffer->push_constant_stages &= ~stages;
 }
 
+static void radv_emit_primitive_reset_state(struct radv_cmd_buffer *cmd_buffer,
+					    bool indexed_draw)
+{
+	int32_t primitive_reset_en = indexed_draw && cmd_buffer->state.pipeline->graphics.prim_restart_enable;
+
+	if (primitive_reset_en != cmd_buffer->state.last_primitive_reset_en) {
+		cmd_buffer->state.last_primitive_reset_en = primitive_reset_en;
+		radeon_set_context_reg(cmd_buffer->cs, R_028A94_VGT_MULTI_PRIM_IB_RESET_EN,
+				       primitive_reset_en);
+	}
+
+	if (primitive_reset_en) {
+		uint32_t primitive_reset_index = cmd_buffer->state.index_type ? 0xffffffffu : 0xffffu;
+
+		if (primitive_reset_index != cmd_buffer->state.last_primitive_reset_index) {
+			cmd_buffer->state.last_primitive_reset_index = primitive_reset_index;
+			radeon_set_context_reg(cmd_buffer->cs, R_02840C_VGT_MULTI_PRIM_IB_RESET_INDX,
+					       primitive_reset_index);
+		}
+	}
+}
+
 static void
 radv_cmd_buffer_flush_state(struct radv_cmd_buffer *cmd_buffer,
-			    bool instanced_draw, bool indirect_draw,
+			    bool indexed_draw, bool instanced_draw,
+			    bool indirect_draw,
 			    uint32_t draw_vertex_count)
 {
 	struct radv_pipeline *pipeline = cmd_buffer->state.pipeline;
@@ -1482,6 +1502,8 @@ radv_cmd_buffer_flush_state(struct radv_cmd_buffer *cmd_buffer,
 
 	radv_cmd_buffer_flush_dynamic_state(cmd_buffer);
 
+	radv_emit_primitive_reset_state(cmd_buffer, indexed_draw);
+
 	radv_flush_descriptors(cmd_buffer, cmd_buffer->state.pipeline,
 			       VK_SHADER_STAGE_ALL_GRAPHICS);
 	radv_flush_constants(cmd_buffer, cmd_buffer->state.pipeline,
@@ -1802,6 +1824,7 @@ VkResult radv_BeginCommandBuffer(
 	radv_reset_cmd_buffer(cmd_buffer);
 
 	memset(&cmd_buffer->state, 0, sizeof(cmd_buffer->state));
+	cmd_buffer->state.last_primitive_reset_en = -1;
 
 	/* setup initial configuration into command buffer */
 	if (cmd_buffer->level == VK_COMMAND_BUFFER_LEVEL_PRIMARY) {
@@ -2309,6 +2332,8 @@ void radv_CmdExecuteCommands(
 		primary->state.emitted_compute_pipeline = NULL;
 		primary->state.dirty |= RADV_CMD_DIRTY_PIPELINE;
 		primary->state.dirty |= RADV_CMD_DIRTY_DYNAMIC_ALL;
+		primary->state.last_primitive_reset_en = -1;
+		primary->state.last_primitive_reset_index = 0;
 	}
 }
 
@@ -2444,7 +2469,7 @@ void radv_CmdDraw(
 {
 	RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
 
-	radv_cmd_buffer_flush_state(cmd_buffer, (instanceCount > 1), false, vertexCount);
+	radv_cmd_buffer_flush_state(cmd_buffer, false, (instanceCount > 1), false, vertexCount);
 
 	MAYBE_UNUSED unsigned cdw_max = radeon_check_space(cmd_buffer->device->ws, cmd_buffer->cs, 10);
 
@@ -2471,18 +2496,6 @@ void radv_CmdDraw(
 	radv_cmd_buffer_trace_emit(cmd_buffer);
 }
 
-static void radv_emit_primitive_reset_index(struct radv_cmd_buffer *cmd_buffer)
-{
-	uint32_t primitive_reset_index = cmd_buffer->state.index_type ? 0xffffffffu : 0xffffu;
-
-	if (cmd_buffer->state.pipeline->graphics.prim_restart_enable &&
-	    primitive_reset_index != cmd_buffer->state.last_primitive_reset_index) {
-		cmd_buffer->state.last_primitive_reset_index = primitive_reset_index;
-		radeon_set_context_reg(cmd_buffer->cs, R_02840C_VGT_MULTI_PRIM_IB_RESET_INDX,
-				       primitive_reset_index);
-	}
-}
-
 void radv_CmdDrawIndexed(
 	VkCommandBuffer                             commandBuffer,
 	uint32_t                                    indexCount,
@@ -2496,8 +2509,7 @@ void radv_CmdDrawIndexed(
 	uint32_t index_max_size = (cmd_buffer->state.index_buffer->size - cmd_buffer->state.index_offset) / index_size;
 	uint64_t index_va;
 
-	radv_cmd_buffer_flush_state(cmd_buffer, (instanceCount > 1), false, indexCount);
-	radv_emit_primitive_reset_index(cmd_buffer);
+	radv_cmd_buffer_flush_state(cmd_buffer, true, (instanceCount > 1), false, indexCount);
 
 	MAYBE_UNUSED unsigned cdw_max = radeon_check_space(cmd_buffer->device->ws, cmd_buffer->cs, 15);
 
@@ -2596,7 +2608,7 @@ radv_cmd_draw_indirect_count(VkCommandBuffer                             command
                              uint32_t                                    stride)
 {
 	RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
-	radv_cmd_buffer_flush_state(cmd_buffer, false, true, 0);
+	radv_cmd_buffer_flush_state(cmd_buffer, false, false, true, 0);
 
 	MAYBE_UNUSED unsigned cdw_max = radeon_check_space(cmd_buffer->device->ws,
 							   cmd_buffer->cs, 14);
@@ -2621,8 +2633,7 @@ radv_cmd_draw_indexed_indirect_count(
 	int index_size = cmd_buffer->state.index_type ? 4 : 2;
 	uint32_t index_max_size = (cmd_buffer->state.index_buffer->size - cmd_buffer->state.index_offset) / index_size;
 	uint64_t index_va;
-	radv_cmd_buffer_flush_state(cmd_buffer, false, true, 0);
-	radv_emit_primitive_reset_index(cmd_buffer);
+	radv_cmd_buffer_flush_state(cmd_buffer, true, false, true, 0);
 
 	index_va = cmd_buffer->device->ws->buffer_get_va(cmd_buffer->state.index_buffer->bo);
 	index_va += cmd_buffer->state.index_buffer->offset + cmd_buffer->state.index_offset;
diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
index 719cc02f50d..00190e7eee0 100644
--- a/src/amd/vulkan/radv_private.h
+++ b/src/amd/vulkan/radv_private.h
@@ -744,6 +744,7 @@ struct radv_cmd_state {
 	struct radv_buffer *                         index_buffer;
 	uint32_t                                     index_type;
 	uint32_t                                     index_offset;
+	int32_t                                      last_primitive_reset_en;
 	uint32_t                                     last_primitive_reset_index;
 	enum radv_cmd_flush_bits                     flush_bits;
 	unsigned                                     active_occlusion_queries;